Selina solutions concise biology class 8 icse Solutions for Chapter 6 the circulatory system

Q1) Given alongside is a diagram of human heart showing its internal structures . label the parts marked 1 to 6, and answer the following questions.

(a) Which type of blood is carried by the blood vessel marked 2 ?

(b) Name the main artery which taked the blood from heart to different parts of the body ?

(c) Which chamber of the heart receives deoxygenated blood rom the body ?

Q2) You can see some blood vessels on the outside of the hands specially in older people. Are those veins or arteries ? How can you confirm your answer.

Q3) Give the functions of lymph. Differentiate between Blood and the lymph.

Q4) Name any two heart conditions that occur commonly. Briefly explain each of them .

Q5)During surgical operations or during accidents, the patient may be given blood from outside to sve his life. What is the technical name of this process ?

Briefly explain the precautions to be observed and taken in this process.

Q6) State briefly, the difference between white blood cells and the red blood cells .

Q7) Answer very briefly, the following :

(a) Red blood cells have no nucleus, then why do we call them cells ?

(b) Why is it necessary to know the blood groups of the donor as well as the recepient ?

(c) Why should the blood going away from the stomach and intestines pass through the liver and not directly to heart ?

Q8) Name the three kinds of blood vessels found in human beings . With the help of suitable diagrams , differentiate between them.

Q1) Put a tick mark against the correct alternative in the following statements:

(a)The only artery which carries deoxygenated blood is called,

1. Hepatic artery

2. Pulmonary artery

3. Aorta

4. Renal artery

(b) Pulmonary vein carries

1. Oxygenated blood

2. Deoxygenated blood

3. Glucose-deficient blood

4. CO2 laden blood

(c) The function of WBCs is to

1. Transport Oxygen

2. Help in the clotting of blood

3. Provide immunity

4. Provide storage of blood

(d) Blood capillary is a

1. Broad tube

2. An artery with thick wall

3. Vein with a large lumen

4. A narrow tube made up of endothelium only.

(e) The nucleus is absent in :

1. RBCs

2. WBCs

3. All blood cells

4. Liver cells

(f) Sphygmomanometer measures:

1. Pulse Rate

2. Heart Beat

3. Blood Pressure

4. Brain activity

(g) The blood tastes saltish due to the presence of dissolved

1. Sodium chloride

2. Potassium Chloride

3. Ammonium Chloride

4. Sodium nitrate

Q1) Differentiate between the following pair of terms :

(a) Pulmonary artery and pulmonary vein

(b) Vena cava and aorta

(c) Platelets and WBC

(d) RBC and WBC

Q2) Give any three differences between an artery and a vein.

Q3) Fill in the blanks :

(a) The two lower chambers of the heart are called __________.

(b) The__________ artery takes the blood from the ventricles to the lungs.

(c) The blood loaded with carbon dioxide from the body comes into the __________ of the heart.

(d) The oxygen-rich blood from the lungs comes into the __________ of the heart.

(e) The oxygen-rich blood is pumped into different parts of the body through __________.

(f) The carbon-dioxide loaded blood from the right ventricle is pumped into the lungs through __________ artery.

(g) The instrument used to find out the blood pressure is known as __________.

(h)The colour of a red blood cell is due to __________.

(i) The blood plasma contains a dissolved substance called __________.

(j) The liquid part of coagulated blood is known as __________.

Q4) In which organ of our body does blood get oxygenated ?

Q5) Which side of the heart ( left or right ) contains oxygenated blood ?

Q6) What is the role of haemoglobin in the blood ?

Q7) Name the disease in which the number of platelets reduces to 25,000 – 30,000 per cubic mm of blood. State its major symptoms .